[dm-crypt] please HELP - can't acces encrypted LVM after linux reinstallation.

Jonas Meurer jonas at freesources.org
Sun Oct 30 23:25:57 CET 2011


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Hi Aleksander,

Am 30.10.2011 19:56, schrieb Aleksander Swirski:
> I will also try to push this info to the debian devs. I'm not sure
> how to do that properly (hint appreciated). I know, that the route
> of installation I took is not a common one, but a simple warning
> would suffice to avoid this kind of trouble. After all my encrypted
> LVM and specifically the /home partition within LVM wasn't listed
> among those, which are to be erased at any point during the
> installation. (I marked them with - K - keep the data)

I guess that you selected to configure the device which contained the
LVM volume group as new encrypted device. Then you where asked for the
new passphrase twice, and a new LUKS header was written to the device,
overwriting the old LUKS header. That way you shredded all the
encrypted data on that device, regardless what it was.

The partitions you marked as "keep the data" weren't overwritten, just
the LUKS header of underlying device was overwritten.

I agree, that a warning in the Debian Installer is a good idea, but to
be honest, there's already a big fat warning:

> _Description: Really erase the data on ${DEVICE}? The data on
> ${DEVICE} will be overwritten with random data. It can no longer be
> recovered after this step has completed. This is the last 
> opportunity to abort the erase.

(from
http://anonscm.debian.org/gitweb/?p=d-i/partman-crypto.git;a=blob;f=debian/partman-crypto.templates)

If you like to propose changes to the (warnings in the) process of
configuring encrypted volumes during installation of Debian, feel free
to discuss this on debian-boot at lists.debian.org. You might as well
take a look at the following page:
http://wiki.debian.org/DebianInstaller/PartmanCrypto

Greetings,
 jonas
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